Dealloying corrosion of anodic and nanometric Mg41Nd5 in solid solution-treated Mg-3Nd-1Li-0.2Zn alloy

doi:10.1016/j.jmst.2020.12.049

IMR OpenIR

	Dealloying corrosion of anodic and nanometric Mg41Nd5 in solid solution-treated Mg-3Nd-1Li-0.2Zn alloy
	Gao, Gui-Jia 1; Zeng, Mei-Qi 1; Zhang, En-Liang 1; Zeng, Rong-Chang 1,2; Cui, Lan-Yue 1; Xu, Dao-kui 3; Wang, Feng-Qin 1; Kannan, M. Bobby 4
通讯作者	Zeng, Rong-Chang(rczeng@foxmail.com) ; Wang, Feng-Qin(skdwangfengqin@163.com)
	2021-08-30
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	83 页码:161-178
摘要	The microstructure and chemical compositions of the solid solution-treated Mg-3Nd-1Li-0.2Zn alloy were characterized using optical microscope, scanning electron microscope (SEM), transmission electron microscope (TEM), electron probe micro-analyzer (EPMA) and X-ray photoelectron spectroscopy (XPS). The corrosion behaviour of the alloy was investigated via electrochemical polarization, electrochemical impedance spectroscopy (EIS), hydrogen evolution test and scanning Kelvin probe (SKP). The results showed that the microstructure of the as-extruded Mg-3Nd-1Li-0.2Zn alloy contained alpha-Mg matrix and nanometric second phase Mg41Nd5. The grain size of the alloy increased significantly with the increase in the heat-treatment duration, whereas the volume fraction of the second phase decreased after the solid solution treatment. The surface film was composed of oxides (Nd2O3, MgO, Li2O and ZnO) and carbonates (MgCO3 and Li2CO3), in addition to Nd. The as-extruded alloy exhibited the best corrosion resistance after an initial soaking of 10 min, whereas the alloy with 4h-solution-treatment possessed the lowest corrosion rate after a longer immersion (1 h). This can be attributed to the formation of Nd-containing oxide film on the alloys and a dense corrosion product layer. The dealloying corrosion of the second phase was related to the anodic Mg41Nd5 with a more negative Volta potential relative to alpha-Mg phase. The preferential corrosion of Mg41Nd5 is proven by in-situ observation and SEM. The solid solution treatment of Mg-3Nd-1Li-0.2Zn alloy led to a shift in corrosion type from pitting corrosion to uniform corrosion under long-term exposure. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Magnesium alloy Corrosion Second phase Rare metal Dealloying
资助者	National Natural Science Foundation of China ; SDUST Research Found
DOI	10.1016/j.jmst.2020.12.049
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[52071191] ; SDUST Research Found[2014TDJH104]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000661886200016
出版者	JOURNAL MATER SCI TECHNOL
引用统计	被引频次：60[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/160482
专题	中国科学院金属研究所
通讯作者	Zeng, Rong-Chang; Wang, Feng-Qin
作者单位	1.Shandong Univ Sci & Technol, Coll Mat Sci & Engn, Corros Lab Light Met, Qingdao 266590, Peoples R China 2.Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450002, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China 4.Univ Newcastle, Sch Engn, Callaghan, NSW 2308, Australia
推荐引用方式 GB/T 7714	Gao, Gui-Jia,Zeng, Mei-Qi,Zhang, En-Liang,et al. Dealloying corrosion of anodic and nanometric Mg41Nd5 in solid solution-treated Mg-3Nd-1Li-0.2Zn alloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,83:161-178.
APA	Gao, Gui-Jia.,Zeng, Mei-Qi.,Zhang, En-Liang.,Zeng, Rong-Chang.,Cui, Lan-Yue.,...&Kannan, M. Bobby.(2021).Dealloying corrosion of anodic and nanometric Mg41Nd5 in solid solution-treated Mg-3Nd-1Li-0.2Zn alloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,83,161-178.
MLA	Gao, Gui-Jia,et al."Dealloying corrosion of anodic and nanometric Mg41Nd5 in solid solution-treated Mg-3Nd-1Li-0.2Zn alloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 83(2021):161-178.